NORMAL-STATE PSEUDOGAP IN THE SPECTRUM OF STRONGLY CORRELATED FERMIONS

Recently a pseudogap with d-wave symmetry was observed near the Fermi level in photoemission spectra of normal-state Bi2Sr2CaCu2O8 crystals. We demonstrate that an analogous pseudogap exists in the energy spect rum of the two-dimensional t-J model of cuprate perovskites. In agreem ent with experiment the magnitude of the pseudogap is 10-20 meV in und erdoped crystals with hole concentration x less than or equal to 0.17 and the pseudogap disappears in optimally and overdoped crystals when x greater than or equal to 0.l7. We demonstrate also that in the t-J m odel the overall energy spectrum near the Fermi level and the Fermi su rface agree well with experimental observations.